autostabilizer
/ˌɔːtə(ʊ)ˈsteɪbɪlʌɪzə/ /ˌɔːtə(ʊ)ˈsteɪb(ə)lʌɪzə/(also autostabiliser)
noun
A device for automatically stabilizing a craft or vehicle.
Origin
Early 20th century; earliest use found in New International Encyclopedia. From auto- + stabilizer.